Lock for producing purl work on flat knitting machines



Oct. 20, 1931. E. o. BOR 1,828,240

LOCK FOR PRODUCING FURL WORK ON FLAT KNITTING MACHINES Filed April 26,1928 2 Sheets-Sheet 1 Oct. 20, 1931. E. o. BORN 1,828,240

LOCK FOR PRODUCING PURL WORK ON FLAT KNITTING MACHINES Filed April 26.1928 2 Sheets-Sheet 2 Q Irwenlar Patented Oct. 20, I

UNITED STATES ERNST OTTO BORN, OF BABENSTEIN, NEAR CHEMNIT Z, GERMANYLOOK FOR PRODUCING FURL WORK ON FLAT KNITTING MACHINES Application filedApril 26, 1928, Serial No This invention relates to flat knitting -ma-'chines for purl knitting in which double ended hooks are used. In formermachines of this type a row is knit by moving themachine through acomplete reciprocation.

The object of the present invention is to increase the output: ofpurling machines by a construction which will produce a. knit row by asingle movement of the carriage in one direction. This is accomplishedby providing two locks in alignment on either side, so that the firstpair of. locks distributes the needle and knits, While the second paircollects the needles and knits. In all known constructions in which twolocks are provided in alignment, the second lock does not produce acomplete knitted row butis used instead to produce a petinet pattern.

Further objects and advantages of the. in-

vention will become apparent from the following description when takenin conjunction with the accompanying drawings which form a part thereof.

In the drawings:

Fig. 1 is a top plan view of the cams and needles, the jacks beingrepresented diagrammatically.

- Fig. 2 is a cross-section on the line A-B, Fig. 1.

Fig. 3 is a top plan view of a modified form of the cams.

In the form shown in Fig. 1, the front and rear cams are the lower andupper cams in Fig. 1 respectively.

The knitting mechanism, comprises the two needle beds a and b, in whichgrooves the double ended needles 0 are movable. These needles are movedin the usual manner by jacks d, e operated by looks or cam beds.

The butts f, i of the jacks engage in the cam grooves g, k of the locksor cam beds 72 m of the beds a, Z) respectively. The jacks on one sidemove the needles forward and at the end of the forward movement releasethe needles 5 so that the jacks of the other bed may grasp These needlesare selected by a jacquard de- 27s,o72, and in Germany April '29, 1927.

vice comprising a series of cards mounted on a cylinder, the cardsmoving towards and from the acks by means of a thrust member whichswings the cylinder at proper intervals. The sinkers e of the jacquarddevice push the selected jacks of the rear bed forward towards the frontbed. Such a device is shown in Austrian Patent No. 1345 at A, Fig. 2.The butts of those jacks which are pushed forward move in the camgrooves, while the butts of the remaining jacks remain outside thechannel and the corresponding needles do not lmit.

At the ends of the cam bed are provided switch camsor ton es 'n, 0. Asshown in Fig. 1, the jacquar will push some of the butts forward to apoint where they will pass below the tongues and into the cam groove.The tongue at the opposite end is in lowered position and serves tocollect the butts again into alignment. When the carriage moves in theopposite direction, the tongue 47. is lowered and the selected buttspass beneath tongue 0 and are collected by tongue n. These tongues maybe raised and lowered by lugs properly spaced on the carriage, or lightsprings may be provided which will normally hold the tongues in loweredposition (as 0,

Fig. 1), but which will permit the'butts to iaiselghe tongues to passtherebeneath (as n,

The particular novelty in the present case resides in the form andarrangement of the high points p, g, 1' and s of the cam grooves, whichmake it possible to knit a complete purl row upon each movement of themachine in one direction.

The cam beds each consist of two locks placed side by side and havingcam grooves in which the butts engage. The high point 71 of the frontbed is displaced to the left of high point 1' of the rear bed, whilehigh point 9 is to the right of high point 8. This is clearly shown bythe broken lines in Fig. 1. The positioning of these high points makesit possible to knit a complete purl row in each movement of the machinein one direction.

Since the high point p is displaced to the Y left than the guide edge uof the hi h point r. The edges t and u operate to ift the jacks so thatthey will disengage the needles. Since the guide edge u terminatesbefore the guide ed t as the cam is moved in the direction of t e arrowin Fig. 1, the acks which have been pushed ahead by the jacquard andwhose butts are in the cam groove is. of the rear needle bed, drop onthe needles and enge them and draw them into the rear needle zd, whilethe jacks in the front needle bed are still disengaged. The needlescorresponding to the jacks which have not been selected by the jacquarddevice will not be engaged by any jacks in the rear needle bed and will,therefore, be held by the jacks of the front needle bed and will bedrawn back into that bed.

In a similar fashion the guide edge of the high point q does not extendto the left as far as the guide edge of the high point 8 and the needlesare, therefore, drawn back by the jacks into the front needle bed.

The operation of the device is as follows:

The jacks e of the rear needle bed b are pushed by a jacquard device toa point where their butts 'i engage in the cam slot is on the rear cambed m, Fig. 1. If the carriage now moves in the direction of the arrowthe jacks e will be moved forward until they reach the needles 0, Fig.2. The high point 1' of the rear cam and the corresponding high point pof the front cam h are staggered slightly, so that the jacks e arewithdrawn by the rear cam m before they are withdrawn by the front camh, and 1n this way the needles 0 are moved with jacks e on the rearneedle bed. In this second set, the high points 9, s of the front andrear cams are again staggered, but this time in the opposite direction.In this way, the needles 0 which have been drawn backward by the rearjacks e are now moved forward, engaged by the front jacks d and, as thefront jacksd are now withdrawn first, these needles 0 are moved forwardto the front needle bed a.

When the cams are now moved in the opposite direction, the jacks (n) onthe rear needle bed (6) will be moved back, first by the cams of theleft hand set, Fig. 1, and in the next art of the operation the jacks(d) of the ront needle bed (a) will be withdrawn first. It is thus clearthat each complete reciprocation of thecams produces two knittingoperations from each bed and doubles the output of the machine.

Of course, the jacquard device may select only certain needles to bemoved into the cam groove. and thus permit rib knitting.

In the modification shown in Fig. 3, two high points (1, d are providedon the rear cam (m) overlsippingeach one on the front. That is, each ofthe 'igh points ((1 d) on the rear cam (m) is less in width than thecorresponding high point (as,'y) of the front cam (h) but the twotogether extend on each side of the high point (x, y) If one or theother of the rear high points is removed, then the front high point willextend farther in one direction than the remaining rear high point. Ifonly the inner points (1 or the outer points d are in use, the actionwill be the same as that described above. If, however, both of the highpoints (d d") are used -in each set, the machine will do straightknitting. If both the high points are used in one set only, the needleswillbe divided and collected only in the other set and the machine willalternate straight knitting and purling or ribbing.

I claim 1. In a purl knitting machine, a carriage, a pair of opposedflat needle beds, a plurality of double ended needles in said beds,means for moving some of said needles from one bed into the second bedand for causing said needles to knit in the second bed, and means formoving the needles completely back again into the first bed and forcausing the needles to knit in the first bed during a movement of thecarriage in either direction whereby the needles knit a complete purlrow during movement of the carriage in one direction.

2. In a purling machlne, a pair of opposed flat needle beds, a pluralityof double ended needles, reciprocal means for dividing and collectingsaid needles twice in one complete reciprocation, means for moving someof said needles from one bed into the second bed and v for causing saidneedles to knit in the second bed, and means for moving said needlescompletely back into the first bed and for causing the needles ,to knitin the first bed during a movement in one direction, whereby the needlesknit a complete purl row during a moveinent in 1one direction.

3. n a pur ing machine, a air of o posed flat needle beds, a cam bedcdirespon ing to each of said needle beds, each cam bed having-two setsof knitting cams thereon, a plurality of double ended needles mounted insaid beds, and means for causing said needles to pass through a set ofcams in one bed to knit in said bed and to pass through a set of cams inthe second bed to knit in said second bed during a single stroke.

4. In a purl knitting machine, a air of flat opposed needle beds, aplurality 0 double ended needles in said beds, means for moving some ofthe needles from one bed into the second bed and for causing the needlesto knit in the second bed, means for moving the needles completely backagain into the first bed and for causing the needles to knit in thefirst bed during a movement inone direction, said means including locks,the central portions of the locks of one of said beds comprising partswhose centers are displaced from the centers of the parts of theopposite locks of the other bed, the parts of the locks of one of thebeds being wider than the parts of the locks of the other bed, a portionof each of said wider parts being removable.

5. In a purl knitting machine, a pair of opposed flat needle beds, aplurality of double ended needles in said beds, a plurality of jacksmounted in said beds, means at each end of one of the beds for forcingsome of said jacks forward to engage the needles while permitting otherof said jacks to remain disengaged from the needles, means for movingthe needles which have been engaged by the jacks from one bed into thesecond bed and for causing said needles to knit in the second bed, meansfor moving said needles completely back into the first bed and forcausing the needles to knit in the first bed during a movement in onedirection and means for collects ing said jacks at the end of a movementof the device in either direction.

In testimony whereof I have aflixed my sig-.

nature.

ERNST OTTO BORN.

